KR870000264A - 전기 절연물용 마그네시아 분말 및 그의 제조방법 - Google Patents

전기 절연물용 마그네시아 분말 및 그의 제조방법 Download PDF

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Publication number
KR870000264A
KR870000264A KR1019860004796A KR860004796A KR870000264A KR 870000264 A KR870000264 A KR 870000264A KR 1019860004796 A KR1019860004796 A KR 1019860004796A KR 860004796 A KR860004796 A KR 860004796A KR 870000264 A KR870000264 A KR 870000264A
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KR
South Korea
Prior art keywords
magnesia powder
less
magnesia
sintered
producing
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KR1019860004796A
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English (en)
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KR890002157B1 (ko
Inventor
야스요시 오다
Original Assignee
신니혼가가꾸 고오교 가부시끼가이샤
야마사끼 다까시
신니혼 가가꾸고오교 가부시끼가이샤
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Publication of KR870000264A publication Critical patent/KR870000264A/ko
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Publication of KR890002157B1 publication Critical patent/KR890002157B1/ko

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
    • C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • H01B3/10—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances metallic oxides
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/42—Heating elements having the shape of rods or tubes non-flexible
    • H05B3/48—Heating elements having the shape of rods or tubes non-flexible heating conductor embedded in insulating material

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Inorganic Insulating Materials (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Resistance Heating (AREA)

Abstract

내용 없음

Description

전기 절연물용 마그네시아 분말 및 그의 제조방법
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음

Claims (10)

  1. 소결된 마그네시아가 90중량% 이상의 MgO 및 0.02중량% 이하의 B2O3로 구성되고, 1000℃에서 107Ωㆍcm 이상 및 600℃에서 109Ωㆍcm 이상의 절연저항을 갖음을 특징으로 하는 분산성이 개선된 전기 절연물용 마그네시아 분말.
  2. 제1항에 있어서, 유동률이 56초 이하인 마그네시아 분말.
  3. 제1항에 있어서, 소결된 마그네시아가 최대직경이 0.8mm 이하이며 주로 단결정인 구형입자를 함유한 마그네시아 분말.
  4. 제3항에 있어서, 단결정 입자의 양이 마그네시아 분말을 구성하는 전체 입자의 숫자에 대해 60숫자% 이상 존재하는 마그네시아 분말.
  5. 제1항에 있어서, 강열감량이 0.2중량% 이하인 마그네시아 분말.
  6. 마그네시아 클링커 분말을 산 수용액으로 세척하여 세척 및 소결된 마그네시아 분말을 수득한 후, 세척 및 소결된 마그네시아 분말을 열처리하여 소결된 마그네시아 분말의 산 라디칼 함량을 0.015중량% 이하로 감소시키거나 세척 및 소결된 마그네시아 분말을 물로 세척하여 소결된 마그네시아 분말의 상 라디칼 함량을 0.015중량% 이하로 감소시키고 건조시킴을 특징으로 하는 분산성이 개선된 전기 절연물용 마그네시아 분말의 제조방법.
  7. 제6항에 있어서, 유동률이 56초 이하인 마그네시아 분말의 제조방법.
  8. 제6항에 있어서, 소결된 마그네시아가 최대직경이 0.8mm 이하이며 주로 단결정인 구형입자를 함유한 마그네시아 분말의 제조방법.
  9. 제8항에 있어서, 단결정 입자의 양이 마그네시아분말을 구성하는 전체 입자의 숫자에 대해 60숫자% 이상 존재하는 마그네시아 분말의 제조방법.
  10. 제6항에 있어서, 강열감량이 0.2중량% 이하인 마그네시아 분말의 제조방법.
    ※ 참고사항:최초출원 내용에 의하여 공개하는 것임.
KR1019860004796A 1985-06-17 1986-06-17 전기 전연물용 마그네시아 분말 및 그의 제조방법 KR890002157B1 (ko)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP60-129954 1985-06-17
JP12995485 1985-06-17
JP61-56900 1986-03-17
JP61056900A JPS6290807A (ja) 1985-06-17 1986-03-17 電気絶縁材料用マグネシア焼結粉体

Publications (2)

Publication Number Publication Date
KR870000264A true KR870000264A (ko) 1987-02-17
KR890002157B1 KR890002157B1 (ko) 1989-06-21

Family

ID=15022541

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019860004796A KR890002157B1 (ko) 1985-06-17 1986-06-17 전기 전연물용 마그네시아 분말 및 그의 제조방법

Country Status (3)

Country Link
US (1) US4879101A (ko)
JP (1) JPS6290807A (ko)
KR (1) KR890002157B1 (ko)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017109710A1 (de) * 2017-05-05 2018-11-08 Dbk David + Baader Gmbh Elektrische Heizvorrichtung und Verfahren zum Erkennen einer Überhitzung einer solchen elektrischen Heizvorrichtung

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2798002A (en) * 1957-07-02 Process for making fused magnesia
DE1200186B (de) * 1960-07-14 1965-09-02 Oesterr Amerikan Magnesit Die Verwendung von Magnesitsteinen fuer die Zustellung von Regeneratoren von Industrieoefen
US3337353A (en) * 1966-01-25 1967-08-22 Corhart Refractories Company I Mgo-b2o3 fused cast refractory
GB1361187A (en) * 1970-10-09 1974-07-24 Steetley Mfg Ltd Refractory substance
US3677779A (en) * 1971-02-16 1972-07-18 Basic Inc Process for improving the hydration resistance of dead-burned magnesia
US4060424A (en) * 1976-02-03 1977-11-29 Norton Company Low temperature setting refractory cements
IT1127263B (it) * 1978-11-28 1986-05-21 Nippon Steel Corp Sostanza di separazione da utilizzare nella fase di ricottura di strisce di acciaio al silicio a grani orientati
JPS59190218A (ja) * 1983-04-12 1984-10-29 Ube Kagaku Kogyo Kk 高密度マグネシアクリンカ−及びその製造法
JPS60129954A (ja) * 1983-12-19 1985-07-11 Matsushita Electric Ind Co Ltd 光磁気デイスクレコ−ダ
JP3308283B2 (ja) * 1991-08-29 2002-07-29 野末 章 水素脆性感受性の低いβ型チタン合金およびβ型チタン合金の熱処理方法
JP2987730B2 (ja) * 1992-07-24 1999-12-06 株式会社フジタ 防火ガラスの接合部
JPH0781467B2 (ja) * 1993-04-06 1995-08-30 ワイケイケイ株式会社 格子付窓枠

Also Published As

Publication number Publication date
US4879101A (en) 1989-11-07
KR890002157B1 (ko) 1989-06-21
JPS6290807A (ja) 1987-04-25

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